324 lines
11 KiB
C
324 lines
11 KiB
C
/* Copyright (C) 1991-1993,1995-2000,2001,2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _FEATURES_H
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#define _FEATURES_H 1
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/* These are defined by the user (or the compiler)
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to specify the desired environment:
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__STRICT_ANSI__ ISO Standard C.
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_ISOC99_SOURCE Extensions to ISO C89 from ISO C99.
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_POSIX_SOURCE IEEE Std 1003.1.
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_POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;
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if >=199309L, add IEEE Std 1003.1b-1993;
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if >=199506L, add IEEE Std 1003.1c-1995
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_XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if
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Single Unix conformance is wanted, to 600 for the
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upcoming sixth revision.
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_XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions.
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_LARGEFILE_SOURCE Some more functions for correct standard I/O.
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_LARGEFILE64_SOURCE Additional functionality from LFS for large files.
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_FILE_OFFSET_BITS=N Select default filesystem interface.
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_BSD_SOURCE ISO C, POSIX, and 4.3BSD things.
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_SVID_SOURCE ISO C, POSIX, and SVID things.
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_GNU_SOURCE All of the above, plus GNU extensions.
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_REENTRANT Select additionally reentrant object.
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_THREAD_SAFE Same as _REENTRANT, often used by other systems.
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The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__.
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If none of these are defined, the default is to have _SVID_SOURCE,
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_BSD_SOURCE, and _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to
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199506L. If more than one of these are defined, they accumulate.
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For example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE
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together give you ISO C, 1003.1, and 1003.2, but nothing else.
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These are defined by this file and are used by the
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header files to decide what to declare or define:
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__USE_ISOC99 Define ISO C99 things.
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__USE_POSIX Define IEEE Std 1003.1 things.
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__USE_POSIX2 Define IEEE Std 1003.2 things.
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__USE_POSIX199309 Define IEEE Std 1003.1, and .1b things.
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__USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things.
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__USE_XOPEN Define XPG things.
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__USE_XOPEN_EXTENDED Define X/Open Unix things.
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__USE_UNIX98 Define Single Unix V2 things.
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__USE_XOPEN2K Define XPG6 things.
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__USE_LARGEFILE Define correct standard I/O things.
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__USE_LARGEFILE64 Define LFS things with separate names.
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__USE_FILE_OFFSET64 Define 64bit interface as default.
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__USE_BSD Define 4.3BSD things.
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__USE_SVID Define SVID things.
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__USE_MISC Define things common to BSD and System V Unix.
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__USE_GNU Define GNU extensions.
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__USE_REENTRANT Define reentrant/thread-safe *_r functions.
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__FAVOR_BSD Favor 4.3BSD things in cases of conflict.
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The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are
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defined by this file unconditionally. `__GNU_LIBRARY__' is provided
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only for compatibility. All new code should use the other symbols
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to test for features.
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All macros listed above as possibly being defined by this file are
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explicitly undefined if they are not explicitly defined.
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Feature-test macros that are not defined by the user or compiler
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but are implied by the other feature-test macros defined (or by the
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lack of any definitions) are defined by the file. */
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/* Undefine everything, so we get a clean slate. */
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#undef __USE_ISOC99
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#undef __USE_POSIX
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#undef __USE_POSIX2
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#undef __USE_POSIX199309
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#undef __USE_POSIX199506
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#undef __USE_XOPEN
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#undef __USE_XOPEN_EXTENDED
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#undef __USE_UNIX98
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#undef __USE_XOPEN2K
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#undef __USE_LARGEFILE
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#undef __USE_LARGEFILE64
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#undef __USE_FILE_OFFSET64
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#undef __USE_BSD
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#undef __USE_SVID
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#undef __USE_MISC
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#undef __USE_GNU
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#undef __USE_REENTRANT
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#undef __FAVOR_BSD
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#undef __KERNEL_STRICT_NAMES
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/* Suppress kernel-name space pollution unless user expressedly asks
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for it. */
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#ifndef _LOOSE_KERNEL_NAMES
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# define __KERNEL_STRICT_NAMES
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#endif
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/* Always use ISO C things. */
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#define __USE_ANSI 1
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/* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */
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#if defined _BSD_SOURCE && \
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!(defined _POSIX_SOURCE || defined _POSIX_C_SOURCE || \
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defined _XOPEN_SOURCE || defined _XOPEN_SOURCE_EXTENDED || \
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defined _GNU_SOURCE || defined _SVID_SOURCE)
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# define __FAVOR_BSD 1
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#endif
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/* If _GNU_SOURCE was defined by the user, turn on all the other features. */
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#ifdef _GNU_SOURCE
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# undef _ISOC99_SOURCE
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# define _ISOC99_SOURCE 1
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# undef _POSIX_SOURCE
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# define _POSIX_SOURCE 1
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# undef _POSIX_C_SOURCE
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# define _POSIX_C_SOURCE 199506L
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# undef _XOPEN_SOURCE
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# define _XOPEN_SOURCE 600
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# undef _XOPEN_SOURCE_EXTENDED
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# define _XOPEN_SOURCE_EXTENDED 1
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# undef _LARGEFILE64_SOURCE
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# define _LARGEFILE64_SOURCE 1
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# undef _BSD_SOURCE
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# define _BSD_SOURCE 1
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# undef _SVID_SOURCE
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# define _SVID_SOURCE 1
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#endif
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/* If nothing (other than _GNU_SOURCE) is defined,
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define _BSD_SOURCE and _SVID_SOURCE. */
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#if (!defined __STRICT_ANSI__ && !defined _ISOC99_SOURCE && \
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!defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE && \
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!defined _XOPEN_SOURCE && !defined _XOPEN_SOURCE_EXTENDED && \
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!defined _BSD_SOURCE && !defined _SVID_SOURCE)
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# define _BSD_SOURCE 1
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# define _SVID_SOURCE 1
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#endif
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/* This is to enable the ISO C99 extension. Also recognize the old macro
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which was used prior to the standard acceptance. This macro will
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eventually go away and the features enabled by default once the ISO C99
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standard is widely adopted. */
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#if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \
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|| (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
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# define __USE_ISOC99 1
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#endif
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/* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2
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(and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined). */
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#if (!defined __STRICT_ANSI__ && !defined _POSIX_SOURCE && \
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!defined _POSIX_C_SOURCE)
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# define _POSIX_SOURCE 1
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# if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500
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# define _POSIX_C_SOURCE 2
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# else
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# define _POSIX_C_SOURCE 199506L
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# endif
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#endif
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#if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE
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# define __USE_POSIX 1
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#endif
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#if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE
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# define __USE_POSIX2 1
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#endif
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#if (_POSIX_C_SOURCE - 0) >= 199309L
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# define __USE_POSIX199309 1
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#endif
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#if (_POSIX_C_SOURCE - 0) >= 199506L
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# define __USE_POSIX199506 1
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#endif
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#ifdef _XOPEN_SOURCE
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# define __USE_XOPEN 1
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# if (_XOPEN_SOURCE - 0) >= 500
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# define __USE_XOPEN_EXTENDED 1
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# define __USE_UNIX98 1
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# undef _LARGEFILE_SOURCE
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# define _LARGEFILE_SOURCE 1
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# if (_XOPEN_SOURCE - 0) >= 600
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# define __USE_XOPEN2K 1
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# undef __USE_ISOC99
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# define __USE_ISOC99 1
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# endif
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# else
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# ifdef _XOPEN_SOURCE_EXTENDED
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# define __USE_XOPEN_EXTENDED 1
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# endif
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# endif
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#endif
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#ifdef _LARGEFILE_SOURCE
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# define __USE_LARGEFILE 1
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#endif
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#ifdef _LARGEFILE64_SOURCE
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# define __USE_LARGEFILE64 1
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#endif
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#if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64
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# define __USE_FILE_OFFSET64 1
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#endif
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#if defined _BSD_SOURCE || defined _SVID_SOURCE
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# define __USE_MISC 1
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#endif
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#ifdef _BSD_SOURCE
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# define __USE_BSD 1
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#endif
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#ifdef _SVID_SOURCE
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# define __USE_SVID 1
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#endif
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#ifdef _GNU_SOURCE
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# define __USE_GNU 1
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#endif
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#if defined _REENTRANT || defined _THREAD_SAFE
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# define __USE_REENTRANT 1
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#endif
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/* We do support the IEC 559 math functionality, real and complex. */
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#define __STDC_IEC_559__ 1
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#define __STDC_IEC_559_COMPLEX__ 1
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/* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.1. */
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#define __STDC_ISO_10646__ 200009L
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/* This macro indicates that the installed library is the GNU C Library.
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For historic reasons the value now is 6 and this will stay from now
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on. The use of this variable is deprecated. Use __GLIBC__ and
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__GLIBC_MINOR__ now (see below) when you want to test for a specific
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GNU C library version and use the values in <gnu/lib-names.h> to get
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the sonames of the shared libraries. */
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#undef __GNU_LIBRARY__
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#define __GNU_LIBRARY__ 6
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/* Major and minor version number of the GNU C library package. Use
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these macros to test for features in specific releases. */
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#define __GLIBC__ 2
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#define __GLIBC_MINOR__ 3
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/* Convenience macros to test the versions of glibc and gcc.
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Use them like this:
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#if __GNUC_PREREQ (2,8)
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... code requiring gcc 2.8 or later ...
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#endif
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Note - they won't work for gcc1 or glibc1, since the _MINOR macros
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were not defined then. */
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#if defined __GNUC__ && defined __GNUC_MINOR__
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# define __GNUC_PREREQ(maj, min) \
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((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
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#else
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# define __GNUC_PREREQ(maj, min) 0
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#endif
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#define __GLIBC_PREREQ(maj, min) \
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((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))
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/* Decide whether a compiler supports the long long datatypes. */
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#if defined __GNUC__ \
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|| (defined __PGI && defined __i386__ ) \
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|| (defined __INTEL_COMPILER && (defined __i386__ || defined __ia64__)) \
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|| (defined __STDC_VERSION && __STDC_VERSION >= 199901L)
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# define __GLIBC_HAVE_LONG_LONG 1
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#endif
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/* This is here only because every header file already includes this one. */
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#ifndef __ASSEMBLER__
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# ifndef _SYS_CDEFS_H
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# include <sys/cdefs.h>
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# endif
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/* If we don't have __REDIRECT, prototypes will be missing if
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__USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */
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# if defined __USE_FILE_OFFSET64 && !defined __REDIRECT
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# define __USE_LARGEFILE 1
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# define __USE_LARGEFILE64 1
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# endif
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#endif /* !ASSEMBLER */
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/* Decide whether we can define 'extern inline' functions in headers. */
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#if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \
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&& !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__
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# define __USE_EXTERN_INLINES 1
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#endif
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/* This is here only because every header file already includes this one. */
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#ifndef _LIBC
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/* Get the definitions of all the appropriate `__stub_FUNCTION' symbols.
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<gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub
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which will always return failure (and set errno to ENOSYS).
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We avoid including <gnu/stubs.h> when compiling the C library itself to
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avoid a dependency loop. stubs.h depends on every object file. If
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this #include were done for the library source code, then every object
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file would depend on stubs.h. */
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# include <gnu/stubs.h>
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#endif
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#endif /* features.h */
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